How to match fa_additions and fa_mass_additions after Delete Mass Additions?

Hello,

We wrote a custom process that copies the mass_additions_id and asset_number from the fa_mass_additions table into a custom table.

In another process we use the asset_number to match to the fa_additions asset_id.  But we found that the Delete Mass Additions process removes our fa_mass_additions records.

This breaks our link from the custom table to the fa_additions table.  Is there another table that stores the relationship between asset_id and mass_additions_id.

Thank you, Kevin